Gov. Gavin Newsom has gradually allowed some businesses to reopen under physical distancing guidelines but not churches, which are limited to online and similar services.
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The governor says churches and other religious institutions could start welcoming back the faithful for limited in-person services in the coming weeks.
On Wednesday, attorney Robert Tyler said a large collective of pastors signed a letter pledging to resume services at the end of the month.
The letter came one day after the U.S. Department of Justice sent Newsom a letter saying his order discriminates against churches.
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Representatives from the governor's office and the California Department of Public Health did not respond to a request for comment.
The Associated Press contributed to this report.